Tool retainer



April 5, 1927,. Re. 16,587"

H. C. GUSTAFSON TOOL RETAINER Original Filed Oct. 10. 1921 25 l9 1.9 O I an Q 25 j W J0 'I T 4,'/

Reissued Apr. 5, 1927.

* UNITED STATES Re. 16,587 PATENT o FIc HJALMER C. GUSTAISON, OF DENVER, COLORADO, AS SIGNOB TO THE DENVER ROCK DRILL MANUFACTURING COMPANY, OF DENVER, COLORADO, A CORPORATION OF DELAWARE.

TOOL RETAINER,

Original No. 1,580,599, dated April 13, 1926, Serial No. 506,731, filed October 10, 1921. Application for reissue filed December 21, 1926. Serial No."156,241.

The present invention relates to tool retainers for rock drills and the like," the object being to provide a no'vel device of this character, soconstructed that the toolretaining means is housed, thereby protecting the same against external in ury, and

yet being readily Operable to release the front elevationzof the holddo i 1511 the embodiment disclosed the front head of'a hammer drill is shown at 6, and

contains the usual tool holder in theform of a rotatable chuck 7 actuated by the piston hammer 8, and having a bore'or socket 9 to receive the tool. tool in the form of a drill steel is illustrated at 10, said steel having a collar 11 thereon.

The front end of the head 6 is reduced, as shown at 12 to form an annular seat that receives the rear end of a hood or housing 13. The front wall 14 of said hood or housing has an opening 15 to permit the passage of the steel 10 into the socket 9, and this opening is of sufiioient size to alsov permit the passage of the collar 11. The inner front end of the housing is provided with rounded seats 15, against which knuckle holding dogs 17 having outstanding finger pieces 18 that pass through openings 1.9 formed in opposite sides of the hood or housing. These dogs incline inwardly and rearwardly and terminate in abutment shoulders 20 that are adapted to engage the front side of the steel collar 11. A coiled spring 21 is located in the hood or housing and is interposed between the dogs and the front end of the head 6, the spring as clearly shown in Figure 2 surrounding the steel and bearing against both dogs.

It will be clear that with this conctruction the drill steel can be passed through the opening 15 and into the socket 9 of the chuck 7. The collar 11 forces the dogs apart and said dogs seat against the steel in advance of the collar. The steel is thus A portion of said automatically" locked in place, but is permitted to have-the necessary play. To detachthe steel it is only necessary to move the finger pieces forwardly, whereupon the dogs will swing outwardly, as indicated in dotted lines and permit the collar to pass between them. I 1

The mounting for the hood 13 comprises rearwardly extending rods 22 forming a part of said hood and slidably engaging in oppositely projecting cars 23 formed on the front 'endof the tool holder 6. These rods have retaining nuts 24 'on their rear ends and interposed between said nuts and cars 23 are relatively heavy springs 25 that serve to yieldingly hold the'hood in its rearmost position and yet permit a yielding forward movement thereof.

From the foregoing, it is thought that the construction, operation and many advantages of the herein described invention will be apparent to those'skilled in the art, without further description, and it will be understood that various changes in the size, shape, proportion; and minor details of construction may be resorted to without" departing from the spirit or sacrificing any of the ad vantages of the invention.

What I claim is:

1. The combination with a tool holderhaving a socket in its front end and outstanding side ears, a hood in advance of the holder having an openingalined with the socket and rearwardly extending rods slidable in the ears, springs on the rods for urging the hood rearwardly, dogs pivotally mounted in the hood and having projecting operatlng means, said dogs having bearings at their front ends against the hood and having abutment shoulders in rear of said bearings for engagement with the front face of the collar of the tool placed in the sockets, and a coiled spring in the hood interposed between the dogs and holder.

2. The combination with a tool holder havinga tool-receiving socket, of a hood mounted on the front end of the holder and having a front wall provided with an opening through which the tool passes, and holding dogs pivotally bearing against-the front wall of the hood on opposite sides of the opening, said dogs having operating means projecting from the hood and having abutment faces at their rear ends for engagement with the frontface of-thecollarof a tool placed in the socket.

3. The combination with a tool holder having a tool-receiving socket, and opposite 1y iprojecting ears, of a hood having rearwa'rdly extending rods slidable in'the ears, retaining devices on the rear ends-of-the rods, coiled springs on the rods between the earsnand-ret'aining devices, saidhoodhaving I a front wall provided with an opening mounted on the front end of the holder and having a tool-receiving opening alined with the socket,=said hood'having a front rounded wall constituting pivot bearings, holding dogs within the hood having rounded 'fro-nt ends pivotally engaged in'the'bearings and having elements projecting outwardly 'from their rear ends and through thehood,'the rear ends of said dogs being provided 'with abutment 'faces for engagement with the front face of the collar of-a'tool placed'in thesocket, and spring means for-normally holding the dogs in their innermost'relation.

holder and having .a front intu'rne'd wall provided with a tool-receiving opening alined with the socket, said wall'having its inner face rounded to form pivot bearings, and iholding dog's Within the hood shaving their f-ront endszrounded and seated against the pivot bearings, said dogs having shoulders that are 4 adapted to engage the ifront ot the-collar ofa took-placed in thei'tool holderand being adaptedto swing outward lyto permit the passage ofvsaid collar.

6. The combination *with a flui'd operated hammer, of a tool holder having LSOGkQtItO receive-the tool operated on byftheihiammer, a hood mounted on the front end of the holder and having a fr'o'nt intu-rned wall provided with a tool'-receiving opening alined with the-socket, said wallxh aving its inner face rounded to 'forniipivot bearings, holding dogs within the hood-havingitheir front ends rounded and seated against the pivot bearings, said dogs having shoulders that are adapted i to engage the Yfront of the collar of atool pla ced initheltodl holder: and being adapted to swing outwardly to permit the passage of *said collar, :means engaged with thedogs. and projectin'gifrom the hood to swingsaid dogs,=:andia coiled spring interposed between the dogswandithe F 130011 holder and of sufficient diameter. to: receive. the tool and:its collar. I V

?In" testimony whereof I "afilx my signature.

: GUSiTA-FSON. 

